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Long answer·Standard multi-step (3/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A source emits electromagnetic radiation of wavelength 3.0×10−2 m3.0\times10^{-2}\text{ m} and another source emits radiation of wavelength 5.0×10−7 m5.0\times10^{-7}\text{ m}. Take c=3.0×108 m s−1c=3.0\times10^8\text{ m s}^{-1}.
Total: 6 marks

(a) Find the frequency of the first radiation. (2 marks)

(b) Find the frequency of the second radiation. (2 marks)

(c) Identify the likely spectrum regions. (2 marks)

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cbse-physics-12.u5.t5-4.laq.004

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